Congrats on the new job, now get read for a rollercoaster career ride!
Start developing your professional soft skills. As highlighted in this thread that communication is important, even if nobody talks to you for a day, make sure the next day you have some sort of conversation with your boss and fellow co-workers. Even if you have to make an excuse to get some face time. Another soft skill is to be a team player. Since you started, you will get fill work until they can attach you to a real project. Even though the fill work is boring, still do it to the best of your ability. Even on a real project, there is still boring work that has to be done and may go to you. Again do the work to the best of your ability. This will show that you are enthusiastic and willing to learn the project from the paper work to the design it self.
Another tip that comes off the top of my head is to cover your butt as much as possible. Make copies of everything you do, decide, direction that you were given, hardware that you are planning to use, emails from and to vendors, any analysis you have done, key conversations you had…etc. Six months from now, somebody is going to come into your cube to discusses why you did something this way at that point you can pull out the info and answer back with some intelligence. Also, apart from keeping an organized notebook this goes the same with your filing cabinet.
Good Luck!
Tobalcane
"If you avoid failure, you also avoid success."